function ajax_modify() { 
	$.ajax({
		type: 'PUT',
		url: '/course',
		data: {
			classid:$("#classid").val(),
	        classname: $("#coursename").val(),
	        the_teacher: $("#courseteacher").val(),
	        week: $("#week").find("option:selected").text() ,
	        startweek:  $("#startweek").val(),
	        endweek:  $("#endweek").val(),
	        starttime:  $("#starttime").val(),
	        endtime:  $("#endtime").val(),
	        place:  $("#place").val(),
		},
		error: function() {
			alert('失败 ');
		},
		success: function(result) {
			console.log(result);
			alert('修改成功 ');
		},
	});
}